code: def _diff_lines(ref_name, ref_lines, lines):
      if ref_lines == lines:
          return
      diff = list(
          difflib.unified_diff(
              ref_lines, lines, fromfile=ref_name, tofile="test output"
          )
      )
      diff = "".join(diff)
      assert False, diff
  
imports: import datetime
  import decimal
  import difflib
  import json
  import os
  import traceback
  from collections.abc import Iterable
  from typing import Any
label_desc: Use image node_id 1 for calling a global function with example usage: _diff_lines(ref_name, ref_lines, lines) without return types